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x in (-oo:+oo)
(4/8)*x-(6/8) = 9/8 // - 9/8
(4/8)*x-(6/8)-(9/8) = 0
(4/8)*x-3/4-9/8 = 0
1/2*x-15/8 = 0 // + 15/8
1/2*x = 15/8 // : 1/2
x = 15/8/1/2
x = 15/4
x = 15/4
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